docs: def show_taghistory():
      """Show history of all known repo/tags for image"""
  
  
      if not nav:
          sys.exit(1)
  
      ecode = 0
      try:
          result = nav.get_taghistory()
          if result:
              anchore_utils.print_result(config, result)
  
      except:
          anchore_print_err("operation failed")
          ecode = 1
  
      contexts['anchore_allimages'].clear()
      sys.exit(ecode)